名词
中文翻译：流体
同义词：
['liquid', 'liquid state']
例句：
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1. The fluid is very viscous and difficult to mix.
这种流体非常粘稠，很难混合。
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2. The scientist used a special fluid to clean the glass.
科学家使用一种特殊的液体来清洁玻璃。
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3. The liquid was so clear that it could be seen through the window.
这种液体如此清澈，以至于可以透过窗户看到。